134 Dr Bischof's Examination of Three Inflammable Gases 



Hydrogen, .... 0.0564 



Carbonic oxide gas, . • • 0.0122 



Carburetted hydrogen gas, . . 0.8351 



defiant gas, .... 0.0963 



1.0000 



We see, however, that this combination cannot exist, be- 

 cause it supposes a much larger quantity of defiant gas than 

 has been found by direct determination by means of chlorine. 

 There therefore remains no other possible combination but 

 the one found above of carburetted hydrogen and olefiant 

 gases, and in that case there must likewise be present a fo- 

 reign non-inflammable gas, — probably nitrogen. 



§ 10. Analysis of Pit-Gas by Oxide of Copper. 



The pit-gas freed from carbonic acid, was secured in a 

 gasometer by water. It was conducted through a tube 18 

 inches long, filled with chloride of calcium, and then through a 

 glass tube 16 inches long, which was filled with oxide of cop- 

 per, and placed in a furnace. A chloride-of-calcium tube 

 took up the water, and Liebig's apparatus absorbed the car- 

 bonic acid. The latter was in combination with a suction-ap- 

 paratus (Saugapparat), which was- so regulated that from 60 

 to 65 drops of water flowed off in the minute. Notwith- 

 standing this slow passage of the gas, a portion of it never- 

 theless escaped combustion. That, however, which was de- 

 composed in the red-hot tube was completely burned ; for when, 

 after an experiment. I closed the combustion-tube (Ferbren- 

 nungs FohreJ, placed the other in lime-water, and strongly 

 heated it, there was scarcely a trace of muddiness perceptible. 

 When the flowing of the gas was interrupted but for a few se- 

 conds, the water formed in the combustion-tube moved back- 

 wards. It hence appears that the analysis of the pit-gas, by 

 means of oxide of copper, is attended with some difficulties 

 which affect the accuracy of the result. The following is the 

 result of one of the most successful experiments. The car- 

 bonic acid amounted to 12.05 grains, the water 10 grains. If 

 we assume 0.76435 as the weight of an atom of carbon, we 

 have as the composition of the pit-gas, 



